Ok first i wanna say, don't take the things i'm about to say to hard because i didn't think your opinion to be bad - everyone deserves an opinion - and there are facts that you can't ignore.
So i'll start with the fact that motorcycle riding is more dangerouse than driving a car, but you have to remember the bad road conditions in israel, the stupid drivers and the bad methodic driving culture. Also i'm a big safety fan. i never ride without a helmet, carbon plated riding gloves, knees protection and a leather riding jacket with back, shoulder and elbow hardened plates. Safety first!!!
Riding is a culture, it's more than a hobby it's food for the soul, something the father you saw must have shared with his daughter. I would agree that it was a bad choise of a day to do so but nevertheless if you are extremely careful you can have an uniqe experience that most folk won't. I can tell you from first hand experience that in Europe, Canada and the Usa it's a whole different story. Most of the motorcycles which is brought to israel hasn't been designed for our country and/or road conditions, a fact that for itself increaces the accidents amount. So to conclude, i hope you won't be so hursh to judge us motorcycle riders next time we meet, and remember always to check the mirrors to aviod an accident with us riders because like you said we are more vulnerable so car drivers should also be extra careful.